Multiple vulnerabilities has been found and corrected in clamav:

Fix infinite loop condition on crafted y0da cryptor file. Identified
and patch suggested by Sebastian Andrzej Siewior (CVE-2015-2221).

Fix crash on crafted petite packed file. Reported and patch supplied
by Sebastian Andrzej Siewior (CVE-2015-2222).

Fix an infinite loop condition on a crafted xz archive file. This
was reported by Dimitri Kirchner and Goulven Guiheux (CVE-2015-2668).

Apply upstream patch for possible heap overflow in Henry Spencer’s
regex library (CVE-2015-2305).

Fix crash in upx decoder with crafted file. Discovered and patch
supplied by Sebastian Andrzej Siewior (CVE-2015-2170).

The updated packages provides a solution for these security issues.